He walked softly up the sanded path, tiptoed up the steps and across the piazza, and rapped at the front door, not too loudly, lest this too might attract the attention of the man across the street. There was no response to his rap. He put his ear to the door and heard voices within, and the muffled sound of footsteps. After a moment he rapped again, a little louder than before.

(uncountable) Blame (for something), whether or not it results in a conviction.

Once upon a midnight dreary, while I pondered, weak and weary, ¶ Over many a quaint and curious volume of forgotten lore, ¶ While I nodded, nearly napping, suddenly there came a tapping, ¶ As of some one gently rapping, rapping at my chamber door. ¶ "'Tis some visitor", I muttered, "tapping at my chamber door — ¶ Only this, and nothing more."

He walked softly up the sanded path, tiptoed up the steps and across the piazza, and rapped at the front door, not too loudly, lest this too might attract the attention of the man across the street. There was no response to his rap. He put his ear to the door and heard voices within, and the muffled sound of footsteps. After a moment he rapped again, a little louder than before.

2012 April 19, Josh Halliday, “Free speech haven or lawless cesspool – can the internet be civilised?”, in the Guardian‎[1]:

But the purported rise in violent videos online has led some MPs to campaign for courts to have more power to remove or block material on YouTube. The Labour MP Heidi Alexander said she was appalled after a constituent was robbed at knifepoint, and the attackers could be found brandishing weapons and rapping about gang violence online.